Ellipsograph.



0. 0. PINE. ELLIPSOGRAPH.

APPLICATION FILED AUG. 25, 1911. 1,031,780. v Patented July 9, 1912.

2 SHBETS8HEET 1.

anneal/ 01 0. 0. PINE. ELLIPSOGBAPH.

APPLICATION FILED AUG. 25, 1911.

2 SHEETS-SHEET 2.

Snow W01 annua 5 Patented July 9, 1912.

Wflmwwo amass o. FINE, or rumors, PENNSYLVANIA.

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Specification of Letters Patent.

Application tiled August 25, 1911. Serial No. 645,907.

To all whom it may concern:

Be it known that I, CHARLES C. FINE, a citizen of' the United States, residin at Nanticoke, in the county of Luzerne, ttate of Pennsylvania, have invented certain new" and useful Improvements in Ellipsographs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which appertains to, make and use thesame.

This invention relates to ellipsogra hs.

The object of the invention resides in the provision of an ellipsograph which may be utilized in describing elllpses of various degrees of curvature in an accurate manner,

, and which will be sim le in construction,

' ing arm.

easy and quick of operation, and which may be manufactured at a. comparatively small cost.

With the above and other objects in view, the invention consists in the details of construction and in the arrangement and combination of parts to be hereinafter more fully described and particularly pointed out in the appended claims. I

In describing the invention in detail, reference will be had to the accompanying drawings, wherein like characters of reference denote corresponding parts in the several views, and in which Figure 1 is a plan view of an ellipsograph constructed in accordance with the invention. F ig. 2, a side elevation of the ellipsograph with the marking arm or beam disposed in the same vertical plane with one of the arms of the cruciform frame of the instrument, Fig. 3, a sectional elevation of what is shown in Fig. 2, the section being taken longitudinallythrough the marking armor beam and the arm of the cruciform frame disposed beneath said marking arm or beam and extending parallel therewith, Fig. 4, an enlarged transverse section showing the connection between the marking arm and the cruciform frame, Fig. 5, an enlarged detail perspective view of one end of the marking arm, showing the bearing of the arm and the resilient pencil holder. Fig. 6, an enlarged detail perspective View of the washer employed in the connections between the cruciform frame and the mark- Referring to the drawings, 10 designates generally the body portion of the instrument, which, as shown, has a cruciform shape, the upper face of the portion having formed therein a pair of grooves 11 and 12 which intersect eachother at right angles and are arranged longitudinally of the four arms of which said body port-ion consists. The grooves 11 and 12 Patented J lily 9,

open through the en'd portion of respective arms of the body and the side walls of respective grooves taper from their bottom toward their top. e body portion of the instrument includes in addition a ring portion 13 disposed concentricallyto the point of intersection of the longitudinal axes of the arms of the body, said ring portion bemg provided with scales representing degrees-of a circle and adapted for use when ever occasion arises. The terminals of the arm of the frame are provided at their lower port-ions with reduced extensions 14: through which are adapted to be forced respectively thumb tacks or other suitable devices to secure the body immovably upon a suitable base.

The instrument further comprises a marking arm or beam A which consists of ,a pair of sections 15 and 16, the former of which is provlded with a longitudinal slot 17 while the latter has fixed thereto clamping collars 18 which embrace the section 15 so as to secure said sections together and at the same time permit longitudinal adjustment of same. By adjusting the sections 15 and 16 ellipses having difierent lengths may be described. The outer end of the section 16 is supported during the operation of the arm of beam A by means of a bearing 19. The outer end of this section 16 is further provided with an opening 20 through which is movable a tubular pencilholder 21, said holder being resiliently supported by a leaf spring 22 anchored to the upper face of the section 16. The beam or arm A carries a pair of corresponding sliding clamps 23 each of which includes a tapering base portion 24: and a vertically extending reduced upper portion 25 which latter is threaded at its outer end. The

section 15 in an immovable manner by means of thumb nuts 30 traveling on the threaded outer end of respective extension 25. i

From the foregoing description it will be apparent that by ad usting the clamps 23 in the slot 17 the, width of the ellipse may be determined, while the length 1s determined by adjusting the sections 15 and 16 longitudinally of each other.

WhatIclaimis: In an ellipsograph, the combination with a supporting frame provided with dove-tail grooves intersecting each other at ri ht angles, a marker supporting arm provi ed with a longitudinal slot, connections be tween the marker supporting arm and the frame, said connections tapered base member slidably mounted in comprising a i each groove of the frame, stems projecting upwardly from each base member and extending through the slot in the marker supporting arm, a pair of plates overlying the marker supporting arm each of which is provided with a reduced extension projectmg into the slot of said marker'supporting CHARLES C. FINE.

Witnesses:

SAMUEL POWELL, THOMAS H. J ONES. 

